High fidelity quantum control over qubits is of crucial importance for realistic quantum computing, and it turns to be more challenging when there are inevitable interactions among qubits. By employing a bandselective shaped pulse, we demonstrate a high fidelity flip over electron spin of nitrogen-vacancy (NV) centers in diamond. In contrast with traditional rectangular pulses, the shaped pulse has almost equal excitation effect among a sharply edged region (in frequency domain). So the three sub-levels of host 14N nuclear spin can be flipped accurately at the same time, while the redundant flip of other sublevels (e. g. of a nearby 13C nuclear spin ) is well suppressed. The shaped pulse can be applied to a large amount of quantum systems in which band-selective operation are required.
@article{arxiv.1404.2519,
title = {Band-selective shaped pulse for high fidelity quantum control in diamond},
author = {Yan-Chun Chang and Jian Xing and Fei-Hao Zhang and Gang-Qin Liu and Qian-Qing Jiang and Wu-Xia Li and Chang-Zhi Gu and Gui-Lu Long and Xin-Yu Pan},
journal= {arXiv preprint arXiv:1404.2519},
year = {2014}
}